I lost my hubby who was 36 yrs sudenely due to cardiac arrest, hv a 3yr old son. Dont kow how to cope?

I dont know how to cope up with the loss of my husband, Suddenely he collapsed n he ped away. Till now I am not being able to handle it. Its been 6 months now, m working, keeping myself busy bt when at night am closing my eyes I feel the terrible loss, I get angry on God, myself and as dont know what to do